login.dart

import 'dart:convert';

import 'package:day4_flutter2/page/page_home_berita.dart';
import 'package:day4_flutter2/ui_view/page_home.dart';
import 'package:day4_flutter2/ui_view/page_register.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';


class PageLogin extends StatefulWidget {
  @override
  _PageLoginState createState() => _PageLoginState();
}

enum LoginStatus {notSignIn, signIn}



class _PageLoginState extends State<PageLogin> {

  LoginStatus _LoginStatus = LoginStatus.notSignIn;
  String email, password;
  final _key = new GlobalKey<FormState>();

  bool _secureText = true;

  showHide() {
    setState(() {
      _secureText = !_secureText;
    });
  }

  check() {
    final form = _key.currentState;
    if (form.validate()) {
      form.save();
      login();
    }
  }

  login() async {
    final response = await http.post(
        "http://192.168.10.232/server_berita/login.php",
        body: {"email": email, "password": password});

    final data = jsonDecode(response.body);
    int value = data['value'];
    String pesan = data['message'];
    String emailAPI = data['email'];
    String namaAPI = data['username'];
    String id = data['id_user'];

    if (value == 1) {
      setState(() {
        _LoginStatus = LoginStatus.signIn;
        savePref(value, emailAPI, namaAPI, id);
      });
      print(pesan);
    } else {
      print(pesan);
    }
  }

  savePref(int value, String email, String nama, String id) async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    setState(() {
      preferences.setInt("value", value);
      preferences.setString("username", nama);
      preferences.setString("email", email);
      preferences.setString("id_user", id);
      preferences.commit();
    });
  }

  var value;

  getPref() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    setState(() {
      value = preferences.getInt("value");
      _LoginStatus = value == 1 ? LoginStatus.signIn : LoginStatus.notSignIn;
    });
  }

  signOut() async {
    SharedPreferences preferences = await SharedPreferences.getInstance();
    setState(() {
      preferences.setInt("value", null);
      preferences.commit();
      _LoginStatus = LoginStatus.notSignIn;
    });
  }

  @override
  void initState() {
    // TODO: implement initState
    getPref();
  }

  @override
  Widget build(BuildContext context) {
    switch (_LoginStatus) {
      case LoginStatus.notSignIn :
        return Scaffold(
          appBar: AppBar(
            title: Text('Login'),
          ),

          body: Form(
            key: _key,
            child: ListView(
              padding: EdgeInsets.all(16),
              children: <Widget>[
                TextFormField(
                  validator: (e) {
                    if(e.isEmpty){
                      return "Please inser Email";
                    }
                  },
                  onSaved: (e) => email =e,
                  decoration: InputDecoration(
                    labelText: "email",
                  ),
                ),

                TextFormField(
                  obscureText: _secureText,
                  onSaved: (e) => password =e,
                  decoration: InputDecoration(
                    labelText: "Password",
                    suffixIcon: IconButton(
                      onPressed: showHide,
                      icon: Icon(_secureText
                      ? Icons.visibility
                      : Icons.visibility_off),
                    )
                  ),
                ),

                MaterialButton(
                  onPressed: (){
                    check();
                  },
                  child: Text("Login"),
                ),
                InkWell(
                  onTap: (){
                    Navigator.of(context).push(MaterialPageRoute(builder: (context) => RegisterPage()));
                  },
                  child: Text(
                    "Create a new Accunt, in here",textAlign: TextAlign.center,
                  ),
                )
              ],
            ),
          ),
        );
        break;
      case LoginStatus.signIn:
        return PageHomeBerita(signOut);
        break;
    }
  }
}